6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 202 -
(i)
Harmonic detection
The operation of each OCN element can be blocked using a scheme switch, if the ICD function
detects a second harmonic current caused by the magnetizing inrush current phenomenon
when a transformer is energized. For example, for the OCN1 element, the scheme switch
[
OCN1-2fBlk
] is provided, and
Block
should be set when the user wishes to block the OCN1
element when the second harmonic associated with magnetizing inrush is present.
Non
is set
for the scheme switch [
OCN1-2fBlk
] as the default setting. For more information about the ICD
function, see Chapter
Relay application: Inrush current detection function
.
(ii)
Blocking OCN by VTF
The operation of the OCN element can be blocked by the voltage transformer failure (VTF)
function via a scheme switch. For example,
Block
is set for the scheme switch [
OCN1-VTFBlk
]
to block the operation of the OCN1 element during a VTF condition.
Non
is set for the scheme
switch [
OCN1-VTFBlk
] as a default. For more information about the VTF, see Chapter
Relay
application: VT failure detection
.
(iii)
Blocking OCN by CTF
The operation of the OCN element can be blocked by the current transformer failure (CTF)
function via a scheme switch. For example,
Block
should be set for the scheme switch [
OCN1-
CTFBlk
] to block the operation of the OCN1 element during a CTF condition.
Non
is set for the
scheme switch [
OCN1-CTFBlk
] as a default. For more information about the CTF, see Chapter
Relay application: CT failure detection
.
(iv)
OCN operation for autoreclose
The OCN element activates the auto-reclose (ARC) function. However, if ARC is not required,
Block
is set for the scheme switch [
OCN1-ARCBlk
].
Block
is set for the scheme switch [
OCN1-
ARCBlk
] as a default.
(v)
Signal of OCN trip
When a user requires an alarm signal in place of the trip signal; for example, set
Alarm
for the
scheme switch [
OCN1-UseFor
].
Trip
is set for the scheme switch [
OCN1-UseFor
] for the normal
trip operation.
2.7.6
Scheme logic
The scheme logic of both the non-directional and the directional OCN1 is illustrated in Figure
2.7-6; Figure 2.7-7 shows grouping commands for the trip circuit (TRC). The OCN1 signal is
generated when the pickup current exceeds a threshold, and then trip signals are injected into
the TRC. (For more information, see Chapter
Relay application: Trip circuit function
)
Содержание GR 200 Series
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Страница 1354: ...6F2S1915 0 46 GRZ200 Soft 031 032 1333 Appendix 1 Signal list for common function ...
Страница 1369: ...6F2S1915 0 46 GRZ200 Soft 031 032 1348 Unit mm Panel cut out for 1 2 case size Figure 2 2 3 Panel cutout figure 1 2 size case ...
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Страница 1480: ...6F2S1915 0 46 GRZ200 Soft 031 032 1459 Appendix 6 Ordering ...
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Страница 1520: ...6F2S1915 0 46 GRZ200 Soft 031 032 1499 Appendix 9 Matrix between VCT terminals and relay applications ...
Страница 1523: ...6F2S1915 0 46 GRZ200 Soft 031 032 1502 Appendix 10 CT requirement ...
Страница 1531: ...6F2S1915 0 46 GRZ200 Soft 031 032 1510 Appendix 12 Engineering exercise ...
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